This week, falling as it does between two minor festivals - the Confession of St. Peter and the Conversion of St. Paul - might best be observed by a pilgrimage to one of the ancient "station" churches common to the liturgical heritage of Rome, the Church of St. Sebastian. It is located south of Rome on the Appian Way, not too far from where the Apostle Paul was supposed to have been beheaded, and it is situated over an ancient catacomb which bears Sebastian’s name. Tradition has it that both Peter and Paul were executed by Nero on June 29, possibly in the same year, 67 A.D. Or, according to another tradition, they were executed on the same day, June 29, one year apart. What is known is that during the persecution of Valerian in 258, a day was set aside - June 29 - to remember and celebrate…